Genus: Megachile Latreille, 1802
Subgenus: Cressoniella Mitchell, 1934
Common name: none
Megachile (Cressoniella) are medium-sized bees with black integument and often with dense long hair that may or may not form pale apical bands hair on the terga (Michener 2007). They range in body length from 9–15 mm (Michener 2007; Gonzalez 2008).
Megachile (Cressoniella) is a sister group to the subgenus Megachile (Dasymegachile), and they have species with similar sizes and hair patterns. Females are four-toothed in both subgenera, but the inner tooth of Megachile (Cressoniella) is truncate or notched, whereas it is acute in Megachile (Dasymegachile). Males of Megachile (Cressoniella) can be differentiated by their four-toothed mandibles and the lack of a spine on their front coxa.
Megachile (Cressoniella) are leaf-cutter bees and use cut pieces of leaves to build their nest cells (Michener 2007). One species, Megachile (Cressoniella) grandibarbis, has been found nesting in old beetle burrows in dead branches and in the soil using the leaves of the genus Nothofagus to build its nest cells (Raw 2007).
There are no known invasives.
Megachile (Cressoniella) ranges from Arizona in the southern U.S. south to Argentina. They are predominantly found in xeric environments, but several species are found in high altitudes within the Andes (Michener 2007; Raw 2007; Gonzalez 2008).